PRELIMINARY FLUTTER ANALYSIS. VOLUME II. EMPENNAGE
GENERAL ELECTRIC CO CINCINNATI OH ADVANCED ENGINE AND TECHNOLOGY DEPT
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Results of the empennage flutter analysis indicate a possible flutter situation existing within the design flight envelope of the XV-5A aircraft. The flutter mode is characterized by horizontal tail pitch coupled with basically symmetric horizontal tail bending for low values of pitch frequencies 40 cps and for pitch coupled with horizontal tail torsion at pitch frequencies greater than 40 cps. The required pitch frequency would be of the order of approximately 55 cps for a flutter velocity margin of 15 of the design limit dive speed at sea-level, which is the critical altitude. Establishment of the actual pitch frequency through experimental methods is required for definite determination of flutter margins. The analyses presented in this report should be taken as a preliminary evaluation of the empennage of the XV-5A aircraft. Subsequent analytical and experimental investigations should then be directed toward finalization of the actual flutter characteristics of the XV-5A aircraft, with due regard for the findings of the studies presented in the report.
- Fluid Mechanics